lmenv(4) on OpenBSD
The text 1c579c3aff29, as OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4, OpenBSD 4.3, OpenBSD 4.2 shipped it.
National Semiconductor LM87 temperature, voltage, and fan sensor